Bi-annual	US dollars
1987-06-30	6524
1987-12-31	8926
1988-06-30	11678
1988-12-31	12322
1989-06-30	13925
1989-12-31	13505
1990-06-30	15802
1990-12-31	16055
1991-06-30	13494
1991-12-31	14040
1992-06-30	11719
1992-12-31	11720
1993-06-30	18728
1993-12-31	15549
1994-06-30	16066
1994-12-31	15360
1995-06-30	18317
1995-12-31	20428
1996-06-30	13764
1996-12-31	14788
1997-06-30	20133
1997-12-31	16933
1998-06-30	19986
1998-12-31	15199
1999-06-30	10112